#include <bits/stdc++.h>
using namespace std;
int main()
{
    int month=1,day=1,ans=0;
    vector<int> m{31,28,31,30,31,30,31,31,30,31,30,31};
    while(month!=12||day!=31){
        if(month==(day/10)+(day%10))ans++;
        day++;
        if(day>m[month-1]){
            month++;
            day=1;
        }
    }
    cout<<ans<<endl;
    return 0;
}